Introduction
236
SmartWare Software Configuration Guide
20 • SNTP client configuration
Introduction
This chapter describes how to configure Simple Network Time Protocol (SNTP) client, it includes the follow-
ing sections:
•
SNTP client configuration task list
•
Recommended Public SNTP Time Servers (see
page 243
)
The Simple Network Time Protocol (SNTP) is an adaptation of the Network Time Protocol (NTP) that is
used to synchronize computer clocks in the Internet. SNTP can be used when the ultimate performance of the
full NTP implementation is not needed. SNTP is described in RFC-2030, “Simple Network Time Protocol
(SNTP) Version 4 for IPv4, IPv6 and OSI”.
SNTP typically provides time within 100 milliseconds of the accurate time, but it does not provide the com-
plex filtering and statistical mechanisms of NTP. In addition, SNTP does not authenticate traffic, although you
can configure extended access lists to provide some protection. An SNTP client is more vulnerable to misbe-
having servers than an NTP client and should only be used in situations where strong authentication is not
required.
SNTP client configuration task list
To configure an SNTP client, perform the tasks described in the following sections. The tasks in the first four
sections are required; the tasks in the remaining sections are optional, but might be required for your applica-
tion.
•
Selecting SNTP time servers (see
page 237
)
•
Defining SNTP client operating mode (see
page 237
)
•
Defining SNTP local UDP port (see
page 238
)
•
Enabling and disabling the SNTP client (see
page 239
)
•
Defining the SNTP client anycast address (see
page 240
)
•
Defining SNTP client constant offset to GMT (see
page 239
•
Enabling and disabling local clock offset compensation (see
page 241
)
•
Defining SNTP client poll interval (see
page 239
)
•
Showing SNTP client related information (see
page 242
)
•
Debugging SNTP client operation (see
page 242
)
